Fuse



y A. LEUSTICE.

FusE APPLICA'TlON FILED MAY I6. l1918.

1,348,4881 A `1 PatentedAug.1920.

PATENT OFFICE.

.ALFRED L. EUSTICE, 0F CHICAGO, ILLINOIS.

FUSE.

Specification of Letters Patent.

Patented Aug. 3, 1920.

Application filed May 16, 1918. Serial N0. 234,859.-

To all whom it may concern:

Be it known that I, ALFRED L. EUSTIGE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Fuses, of which the following is a specification.

This invention relates to fuses.

One of the objects of the invention is to prevent shrinkage of the shell and especially the ends thereof to overcome any tendency of theferrules from becoming loose on the shell.

Another object is to provide a novel fuse, simply and compactlyA arranged, and adapted to meet the requirements for service conditions.

These and other objects are accomplished by means of the fuse disclosed by the accompanying sheet of drawings, in which- Figure 1 is a longitudinal sectional view of my improved fuse.

Fig. 2 is a sectional View of the same, taken in the plane of line 2-2 of Fig. 1, and

Figs. 3, 4 and 5 are transverse sectional views taken respectively, in the planes of lines 3 3, 1 -4 and 5-5 of Fig. 2.

The various novel features of my invention will be apparent from the following description and drawings and will. be particularly pointed out in the appended claims.

Referring to the figures of the drawings, it will be noted that my electric fuse includes a shell 10 of some good insulating material, such as fiber. Mounted over each end of the shell is a ferrule 11 of conducting material, having an inwardly extending annular shoulder or projection 12 whic abuts the end of the shell, said ferrule also having an internally threaded portion 13 at the end thereof. Threaded within each end of the shell 10 is a sleeve member 14, which is externally threaded to coperate with an internally threaded portion 15 at the ends of thel shell 10. Each of said sleeves has a shoulder 16 abutting the ferrule shoulder 12 for holding the ferrule l1 against'an outward movement of the shell, the ferrule projection 12 being interposed between the end of the shell and the sleeve shoulder 16. The sleeve 14 not only serves the function of preventing outward movement of the ferrule 11, but also prevents the shell 10 and more particularly the ends thereof from shrinking, thereby overcoming any tendency of the ferrules from becoming loose on the shell. After the sleeve 14 is set in place, the outer end thereof is spun radially outwardly to in.

ing through the apertures and bent over into enga ement with the outer sides of the washer 1 An externally threaded plug 20 is threaded into the threaded end portion of the ferrule 11 for securely gripping the overturned end ofthe fusible element 19 between the washer 17 and plug 20 at each end of the fuse. The plugs 20 are provided with suitable vent openings 21, which normally are covered by the overturned ends of the fusible member 19. To further prevent removal of the ferrule 11 and to interlock the ferrule 11, shell 10 and sleeve 14 together, at each end, a pin 22 is driven through registering openings in said parts. There may be various modifications of my invention, and it is my intention tn cover all such modifications, which do not involve a departure from the. spirit and scrpe of the following claims.

, claim:

1. In an electric fuse, the combination( of a shell, a ferrule fitting over the end of the shell and having a shoulder, a sleeve threaded into the shell and engaging said shoulder to hold the ferrule in place, an apertured washer abutting said sleeve, a fusible member extending through the aperture in said washer, and a plug asso. ciated with said ferrule for clamping the end of the fusible member between the washer and plug.

2. In an electric fuse, the combination of a shell, a ferrule fitting over the end of the shell and having a shoulder and a threaded portion, a sleeve threaded into the shell and engaging said shoulder to hold the ferrule in place, an aperturedvwasher abutting said sleeve, a fusible member having the end thereof extending through the aperture in said washer and bent laterally over the washer, and a plu threaded into the ferrule for clamping t e end of the fusible member between the washer and the plug. l

A 3. In an electric iuse, the combination of a shell, a errule itting over the end of the shell and having a shoulder and a threaded portion, a sleeve threaded into the shell and engaging said shoulder to hold the ferrule in place, an apertured Washer abutting said sleeve, a fusible member having the end thereof extending through the aperture in said washer and bent laterally over the Washer, a plug threaded into the ferrule for clamping the end of the fusible member between the Washer and the plug, and means for interlocking the ferrule, shell and sleeve. v

4. In an electric fuse, the combination of a shell, and a closure therefor including a ferrule fitting the outside of the shell, and

a sleeve threaded into the shell for preventing shrinkage o the latter and provided with means for holding the errule on the shell.

5. In an electric fuse, the combination of a shell, and a closure therefor including a ferrule fitting th'e outside of the shell and having an inwardly extending projection, and a sleeve threaded into the shell for preventing shrinkage of the latter and having a portion engaging the projection of thevferrule for holding the ferrule on the shell.

Signed at Chicago, Illinois, this 11th day of May, 1918.

ALFRED L. EUSTICE. 

